1. I. Kotsireas and D. Lazard, Central configurations of the 5-body problem with equal masses in three-dimensional space, Zap. Nauchn. Sem. S.-Peterburg. Otdel. Mat. Inst. Steklov. (POMI) 258 (1999), no. Teor. Predst. Din. Sist. Komb. i Algoritm. Metody. 4, 292–317, 360–361.[MR]